08-09-2005, 08:06 AM
After recently purchasing a p25 for motor testing i was quite alarmed at the screech on start up for low wind outrunner type motors,on questioning Castle Creations about this i was sent this reply. The noise is caused by the startup routine which uses a lower frequency PWM so that we can oversample the back-emf at high rate -- so we can get a smoother start. It's a by-product and has no effect on the performance of the motor. You can always revert the software to an earlier version (1.021) to get rid of the noise, but the startup performance is lower than with the newer (louder) software, i am awaiting the delivery of the phx link to do just this, and will post my results . cheers Lez.